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W. P. 01010310010. VACUUM PUMP.

No. 280,000. Patented Jul 3, 1883..

N. PETERS. Pnclnimu n her. Wnhinglnn, D.C

7 eiency of the pump.

it UNITED STATES PATENT OFFICE.

WILLIAM-F. GARR'ISON, OF BROOKLYN, NEWV YORK, ASSIGNOR TO GUILD &GARRISON, OF SAME PLACE.

VACUUM-PUMP.

SPECIFICATION forming part of Letters Patent No. 280,600, dated July 3,1883.

Application filed January 31,1883.

To all whom it may concern:

Be it known that I, WILLIAM F. GARRISON, of the city of Brooklyn, in thecounty of Kings and State of New York, have invented a new and usefulImprovement in Vacuum-Pumps, of which the following is a specification.

In vacuum-pumps it is of great importance that all the air contained inthe pump-cylinder and passages should be discharged at each stroke ofthe piston, as any air remaining in the cylinder or passages at thecommencement of the return-stroke would expand, and such air would becompressed and expanded at each stroke of the piston without beingdischarged, thereby greatly impairing the effi- Such vacuum pumps areusually worked with a quantity of water in the air-cylinder sufficientto nearly or quite fill the passages when the piston is at the end ofits stroke.

My invention relates to vacuum pumps the axis of the cylinder; and Fig.2 representsa longitudinal section on the plane of the dotted line a:00, Fig. 1.

Similar letters of reference designate corresponding parts in both thefigures.

A designates the cylinder of a vacuum; pump, wherein a piston, A, is tobe reciprocated ,by a steam-cylinder or other suitable means, and whichis provided with heads A A.

B designates a water and air chest, here represented as arranged abovethe cylinder and divided by a transverse partition, B, into twocompartments, which communicate with the two ends of the cylinder byports or passages a in the cylinder.

0 designates the suction-valve chest, and D (No model.)

designates a discharge-valve chest, which are separated from each otherby a partition, 0. The suction-valve chest 0 is separated from the waterand air chest B by a partition, 0 and the discharge-valve chest D isseparated from said water and air chest by a partition, D. The suctionand discharge valve chests O D are closed by a cover, E, from whichextends the discharge air-pipe E, while E designates the opening throughwhich the suc tion-pipe (not here shown) communicates with thesuctionvalve chest 0. The partition C contains the seats for thedownwardlyopening suction-valves F, and the said valves are accessiblethrough hand-holes B in the water and air chest B. The partition 'Dcontains the seats for the upwardly-opening dischargevalves F. Thevalves may be of any suitable kind. The water and air chest B, thesuction and discharge valve chests O D, and the partitions O, O", and Dare all shown as formed integral in one casting, and this is a greatadvantage, as then the cover E forms the only joint in the chest, andthis joint is way above both the suction and discharge valves. Thepartition D, wherein are the discharge-valves F, is not horizontal, butis inclined from its junction with the partition 0" upward and outwardnearly to the cover E. This construction is advantageous for manyreasons. It enables me to reduce the size of the water and air chest fora given number of dischargevalves, or to get in a greater valve area ina chest of a given size. The shock of the water striking on thepartition or valve-seat D at the discharge is greatly reduced below whatit would be if the partition or valve-seat were horizontal. The suctionvalves F can be brought lower down, so that they will be covered withwater earlier in the stroke, and the partitions C D are brought down sonear to the cylinder that there is no need of extending a bar across theports a, as is usually done, and consequently I get a large portextending around half the circumference of the cylinder, as shown inFig. 1. Such large ports are very advantageous, as the water is movedwithless disturbance and its velocity is not greatly accelerated inpassing through the ports. The

suctioirvalves are brought so low down that the suction-pipe maybesecured to the side of the suction-valve chest C, and the height of thewhole structure can be reduced.

Obviously the partition D, instead of being inclined from the inner sideof the chest D upward and outward, might be inclined from the outer sideof said chest at a point just above the suction-valves upward and inwardto the top of the partition 0.

I am aware of Letters Patent N 0. 224,179, granted February 8, 1880, to\Villiam H. Guild, Jr., for improvements in vacuum-pumps, and I do notclaim anything which is shown therein as of my invention. Myconstruction is different from that shown in the patent. I form mycylinder, divided water and air chest, suction and discharge chests,partitions separating the suction and discharge chests from each otherand from the water and air chests, the latter partitions separating thesuction and discharge chests from the water and air chest containing theseats for the suction and discharge valves, all in one and the sameintegral structure, and employ a simple cover or bonnet for closing thesuction and discharge chests. This construction enables me to bring theonly joint in the valve chests above both the suction and dischargevalves. In the aforesaid patent 'the suction and discharge chests areformed in a separate structure from the cylinder, which is secured tothe structure containing the cylinder by a joint which is on a levelwith the dischargevalves, and both the suction and discharge pipes mustbe removed it it is desired to open or remove the suction and dischargechests. In my construction the cover of the suction and discharge chestsmay be removed and access aiiordcd to the chests by simply removing thedischarge-pipe and without disconnecting the suction-pipe, which boltedto the suction-chest below the joint of the cover.

What I claim as my invention, and desire to secure by Letters Patent, is

l. The combination of the air-cylinder A,

the divided water and air chest 13, communicating with the ends of thecylinder, the partition 0, containing the seats for downwardlyopeninginlet-valves, and the partition 1), containing the seats forupwardly-opening outletvalves, having an inclination above the saidpartition C substantially as and for the pun pose herein described.

2. The combination of the air-cylinder A, the dividedwater and air chestB, co1n1nunieating with the ends of the cylinder, the suc tion anddischarge chests C D, separated from each other by the partition 0 andfrom. the chest B by the partitions C D, which contain the valve-seats,all said parts being formed in one integral structure, and the removablecover for the suction and discharge chests, the joint of the cover beingentirely above the valves, substantially as described.

3. The combination of the water and air chest B, the suction anddischarge valve chests U and l), the inclined partition I), separatingthe chests l3 and I) and containing discharge valves, and the partition0, separating the chests l3 and C and containing suction-valves, allsubstantially as herein described.

XVM. l1. G-ARR'ISON.

\Vitnesses:

Fnn'nn. IL YNES, IE1). L. 1\I()RAN.

